Border Gateway Protocol (BGP) is considered a “Path Vector” routing protocol. It is an exterior gateway protocol (EGP) that is used to exchange routing information among routers in different autonomous systems. It is the only protocol which enables Internet to function. So it is very robust and scalable routing Protocol.
Once BGP peers form a neighbor relationship, they share their full routing table. Afterwards, only changes to the routing table are forwarded to peers.
BGP metric is BGP attributes. It has 3 tables, neighbor table, BGP table and Routing table.The AD (Administrative Distance) for eBGP routes is 20, iBGP is 200. It uses TCP-179. It's Peers use incremental and triggered updates(5 sec interval for IBGP and 30 sec interval for EBGP). It uses AS numbers to keep track of different administrative domains. 1-64511 are public, 64512-65535 are private autonomous numbers.
This course has many Labs which will make you very strong and comfortable in Implementing this protocol in your organization or at your home lab. You will get expertise on Attributes of BGP such as Weight, Local Preference, AS Path, MED , ORGIN and Communities. Since It runs the Internet, so we need a protocol which gives flexibility, that is why BGP is used. Only drawback is that It is extremely slow to converge.
Many more things like Route Reflectors, Confederation are also covered so that you get complete information about this BGP.
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You will learn how to enable BGP on cisco Routers. It is very simple configuration. This chapter is going to be Base foundation of BGP
Sometimes, you do not have to configure BGP peering with Directly connected neighbors. In that you need to use "update-source" command for that neighbor. You can also use Loopback Interfaces for forming iBGP or eBGP
iBGP means when your peer BGP router is also present in same Autonomous System. See How you can configure it and How you can verify iBGP configuration
Reading BGP Table is not that easy. However- It is not very tough as well. So I will take you to the output of BGP and explain you all the important points
Lets dig more and understand further on BGP table.
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